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What's the best way to make a Bootstrap 5 website compatible with IE and other old browsers

I'm starting to build websites using Bootstrap 5 and will be using the WebP image format. I understand Bootstrap 5 has stopped support for Internet Explorer. I would like advice on the best feature detection and polyfill applications to use to ensure my websites gracefully degrade on IE and other older browsers.

My main requirement is to detect WebP support and deliver other image formats if there is no support. What other features should I detect to ensure my Bootstrap 5 website doesn't break completely?
CSSJavaScript* HTML 5jQueryBootstrap

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8/22/2022 - Mon